import React, { Component } from 'react'
import './index.css'

export default class Item extends Component {

  // 标识鼠标移入移出
  state = {mouse:false}

  // 鼠标移入移出事件回调
  handleMouse = (flag) => {
    return ()=>{
      this.setState({mouse:flag})
    }
  }

  // 勾选,取消勾选回调
  handleCheck = (id) => {
    return (event) => {
      const {updateTodo} = this.props
      updateTodo(id,event.target.checked)
    }
  }

  // 删除todo的回调
  handleDelete = (id)=>{
    return ()=>{
      const {deleteTodo} = this.props
      deleteTodo(id)
    }
  }

  render() {
    const {id,name,done} = this.props
    const {mouse} = this.state
    return (
      <li 
        style={{backgroundColor: mouse ? '#ddd' : '#fff'}} 
        onMouseEnter={this.handleMouse(true)} 
        onMouseLeave={this.handleMouse(false)}
      >
        <label>
          <input type="checkbox" checked={done}  onChange={this.handleCheck(id)}/>
          <span>{name}</span>
        </label>
        <button onClick={this.handleDelete(id)} className="btn btn-danger" style={{display: mouse ? 'block' : 'none' }}>删除</button>
      </li>
    )
  }
}
